<?php
require_once 'class/lib/iexportable.php';
require_once 'class/lib/object.php';
/**
 * ExportableObject class, define export functions.
 * @abstract
 * @package lib
 * @author alcaitiff
 */

abstract class ExportableObject implements iExportable
{
    /**
     * Convert an object to a json string
     * @return string
     */
	public function toJSON(){
		return $this->indent(json_encode($this->export())); 
	}
    /**
     * Export an object to be converted in a json string
     * @return Object
     */
	public function export(){
		$obj=new Object();
		foreach ($this as $key => $value)
    	{
        	if(is_array($value) && count($value)>0 && $this->hasExportableObject($value)){
        		$auxArray=array();
        		foreach($value as $innerKey=>$innerValue){
	        		if($innerValue!==null){
		        		$auxArray[$innerKey]=$innerValue->export();
		        	}else{
		        		$auxArray[$innerKey]=null;
		        	}
	        	}
	        	$obj->$key = $auxArray;
        	}elseif($value instanceof iExportable){
        		$obj->$key = $value->export();
        	}else{
	        	$obj->$key = $value;
	        }
	    }
    	return $obj; 
	}
	/**
     * Magic Get
     * @param string $property
     * @return mixed
     */
	public function __get($property){
		return $this->$property;
	}
    /**
     * Verify if the array have exportable objects
     * @param array $array
     * @return boolean
     */
	public function hasExportableObject($array){
		 foreach($array as $value){
		 	if($value!==null && ($value instanceof iExportable))
		 		return true;
		 	elseif($value!==null)
		 		break;
		 }
		 return false;
	}
	/**
	* Indents a flat JSON string to make it more human-readable
	*
	* @param string $json The original JSON string to process
	* @return string Indented version of the original JSON string
	*/
	private function indent($json) {

		$result = '';
		$pos = 0;
		$strLen = strlen($json);
		$indentStr = ' ';
		$newLine = "\n";
		$prevChar = '';
		$outOfQuotes = true;

		for($i = 0; $i <= $strLen; $i++) {

		// Grab the next character in the string
		$char = substr($json, $i, 1);

		// Are we inside a quoted string?
		if($char == '"' && $prevChar != '\\') {
		$outOfQuotes = !$outOfQuotes;
		}
		// If this character is the end of an element,
		// output a new line and indent the next line
		else if(($char == '}' || $char == ']') && $outOfQuotes) {
		$result .= $newLine;
		$pos --;
		for ($j=0; $j<$pos; $j++) {
		$result .= $indentStr;
		}
		}
		// Add the character to the result string
		$result .= $char;

		// If the last character was the beginning of an element,
		// output a new line and indent the next line
		if (($char == ',' || $char == '{' || $char == '[') && $outOfQuotes) {
		$result .= $newLine;
		if ($char == '{' || $char == '[') {
		$pos ++;
		}
		for ($j = 0; $j < $pos; $j++) {
		$result .= $indentStr;
		}
		}
		$prevChar = $char;
		}

		return $result;
	}
}